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Tools.JSON 
Tools.JSON.JSONObject 
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    Method Tools.JSON.JSONObject()->optFloat()
    
 
- Method
optFloat
- 
  float optFloat(string key, float|void defaultValue)  
- Description
- 
  Get an optional double associated with a key,
 or NaN if there is no such key or if its value is not a number.
 If the value is a string, an attempt will be made to evaluate it as
 a number. 
 
- Parameter key
- 
  A string which is the key. 
 
- Parameter defaultValue
- 
  The default 
 
- Returns
- 
  A double value object 
 
     
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